I use as a hobby, but spread this product to the part trouble when the water soaks. Than peddle the meter unit of the plastic sheet in the hardware store, etc., it went up cheaply.
But difficulty is, is about painful and right angles of the four corners of the case touches a very sharp. If attached to the four corners of the processing even R2mm, I think the best of the products.
However, since the soft case A3 size is not sold at 100 yen shop, it was very helpful.